Steam-boiler.



BEST AVAILABLE COP.

PATENTBD MAY 10, 1904.

A. G. HOHENSTEIN.

STEAM BOILER.

APPLIOATION FILED JUNE 1. 1903.

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NO MODEL.

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A. G. HOHENSTEIN.

STEAM BOILER.

APPLIOATION FILED JUNE 1. 1903.

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BEST AVAILABLE COIPATENTED MAY 10, 1904.

A. G. HOHENSTEIN.

STEAM BOILER. APPLICATION FILED JUNE 1. 1903.

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No. 759,517. PATENTED MAY 10, 1904.

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No. 759,517. BEST AVAILABLE COPPATENTED MAY 10, 1904. A. G. HOHENSTEIN.STEAM BOILER..

APPLICATION FILED JUNE 1. 1903. no MODEL. '1 SHEETS-SHEET 5.

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STEAM BOILER.

APPLIOATION rum) JUNE 1. 1903.

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BEST AVAILABLE COP PATENTBD MAY 10, 1904.

A HOHENSTEIN.

AM BOILER BEST AVAILABLE COP Patented May 10, 1904.

UNITED STATES PATENT ()FFICE.

ARCI-IIE Gr. HOHENSTEIN, OF HAVEN, CONNECTICUT.

.' s EAMeB'QILER.

SPECIFICATION formingpart of Letters rarest No. ,'759, 517, dated May10, 1904. Application filed June 1, 1903. Serial Ila-159,681. (Nomodel.)

T0 at whom it may concern:

Be it known that I, ARCHIE GERRY HOHEN- STEIN, a citizen of theQUnitedStates, residing at New Haven, inthe countyof .New Haven and State ofConnecticut, have invented or discovered certain new and usefulImprovements in Steam-Boilers, of which improvements th following is aspecification. I

The invention described herein relates to certain improvements in that"class or-kind of water-tube boilers forming the subject-matters ofLetters PatentNos. 661,528 to 661,534, granted to me-Nov'ember 13, 1900;and the invention has for its object a construction wherein suitablewater-walls are provided at the sides of the fire-chamber and atintermediate points, as desired.

The invention is hereinafter more fully de-. scribed and claimed. 4

In the accompanying drawings, forming a part of this specification,Figure-1 is a front elevation of a boiler embodying my improvements.Fig. 2 isa'rear elevation-of the same. Fig. 3 is a view similar to Fig.2, illustrating a modification in the arrangement of the lower headersand the downtakes and also showing a portion of the inclosing casing.-Fig. 4 is a sectional elevation of the construction shown in Fig. 3.Figs. 5 and 6 show asectional elevation and a rear elevation of amodified form or construction for the upper portion of the boiler. Fig.7 is a-rear elevation of the lower portion of the boiler, illustrating amodification of the construction shown in Fig. 2. "Fig. 8 is a sideelevation of the portion-of the boiler shown in Fig. 7 Figs. 9 and 10are sectional detail views illustrating the valve between the 1 headersand the equalizing-chambers. Fig. 11 is a rear elevation of the lowerportion of the boiler, illustrating a modification in the constructionof the headers; and Fig. 12 is a sectional plan view on a planeindicated by the of the boiler, where the tubes of one series areconnected to those of the other by means ofjunction-boxes 9. These tubesare made ofsuch a length that the junction-boxes lie in a'plane with theupper and lower rear headers. The. upper and lower rear headers 3 and 4are connected by two series of tubes 7 and 8,

extending from said headers toward the front of the boiler, where thetubes of one series are connected to those of the other series byjunction-boxes 9, arranged in the plane of the front headers. The upperheaders 2 are connected by a series of tubes 17 to the .upper rear drum16, and the upper rear headers 4 are connected directly to the samedrum. By this construction the two systems of circulation starting fromthe lower headers 1 and 3 are discharged into a common drum 16, intowhich the feed-water is discharged through a suitable pipe 14. This drumis connected by a series of downtakes 20 with the respective lower rearheaders 3, said headers being in turn connectedto thelower ends of thelower front headers 1 by the furnace-tubes 11. By this construction thedowntakes 20 serve to supply both systems of circulation, the onestarting-fromthe lower rear header 3 and passing by the tubes 7 and 8 tothe upper rear headerand thence to the drum 16. The other system ofcirculation starts fromthe lower rear header 3, and the water passesthence by the furnace tubes 11 to the lower front header 1, thence bythe tubes 5 and 6 to the upper front header, and from this header to thedrum by the tubes 17 In'order to form side water-walls for the furnaceor fire-chamber of the boiler, the lower front and rear headers at theends of two series are extended down to or below the level of thegrate-bars. All of the lower rear headers may be extended, as shown inFig. 8, a greater distance to form pockets or receptacles for any solidmatter in the circulation. These extensions of the headers at the endsof the series are connected by tubes 36 of such dimensions and soarranged in the headers as to form a practically closed wall at eachside of the furnace or fire-box. Where the firebox is wide, it may bedivided into two or more chambers by extending one or more of to theextensions of the headers at points be'* low the junction of the tubes36 with such extensions, so that a full supply of water is as sured forthese tubes 36, which form parts of the circulatingsystem of the boiler.The inter mediate lower rear headers 3 are connected by nipples 37 toequalizing-boxes 38 at their lower ends, and the boxes are in turnconnected at their ends to the extended headers by similar nipples.These boxes While not in the circulation serve not only to insure anequal and uniform supply of Water to the headers, but also as areceptacle for solid matter in the water; For the removal of the solidmatter these boxes are connected, as shown in Figs. 4, 7, and 8, tosuitable blow-off pipes 39, a connection being formed by preferencethrough the extended headers. As shown in Fig. 2, the equalizing box orboxes 38 may be supported on brackets 40, secured to the extensions ofthe headers and also having intermediate supports 41.

As shown in Figs. 3 and 4, all of the headers 3 may be extended downbelow the. junction of the furnace-tubes 11 therewith. In such aconstruction the equalizing boxes would be supported by the floor of thefire-' room. In order to afford ample space for connecting the tubes 36with their headers, the latter are preferably made longer than theintermediate headers, extending down along the ends of theequalizing-boxes, as shown in Figs. 3 and 4. As the equalizing-boxes arenot designed to form part of the circulating system of the boiler. butare employed simply for equalizing the supply to the headers per frontheaders and by tubes 18 to the upper rear drum. This constructionprovides a greatly-increased steam-breaking space, insuring drier steamand a steadier water-level.

As shown in Figs. 1 and 4c, pipes 43 are arranged across the front andrear of the boiler, said pipes being provided with nipples or nozzles4:4, projecting between adjacent headers. The front pipes, with theirnozzles, are so ar- BEST AVAILABLE COP ranged as to blow the dust, &c.,from the tubes and the bafiie plates toward the rear of the boiler. Therear pipe has its nozzles so arranged that the dust and dirt forced tothe rear of the boiler will be blown down onto the bafiie-plate 45, fromwhich the dust, &c., can be removed through an opening formed in theside casing.

It is characteristic of my improved boiler that a deeper fire-box andincrease of heatingsurface for the same floor-space is provided withoutinterfering with the circulation. The large upper drum 16 insures a fulland constant head of water for supplying the downtakes which feed thetwo circulating systems. 7

The equalizing-boxes perform the principal function of the lower drum ofinsuring a supply to the circulating systems in case of the stoppage ofany of the downtakes.

By reference to Fig. 4: it will be observed that as the tubes composingthe two connected series 5 and 6 and also those of the series 7 and 8have their connected ends alongside of each other the headers in the twolower series must be arranged out of line with those of the two upperseries of headers to avoid bending the tubes. As the lower rear headersare offset in one direction, as to the left, as in Fig. 2, and the frontheaders in the opposite direction or to the right, as in Fig. 1, thefurnacetubes 11 and the water-wall tubes 36, connecting the front andrear lower headers, would extend at an angle across the boiler. In orderto avoid this angular arrangement of the tubes 11, the lower ends of thelower series of headers are bent to one side, so as to bring the tubes11 parallel with the tubes in series 5, 6, 7, and 8 or at right anglesto the front of the boiler, as shown in Fig. 12. It is preferred thatthe entire correction of this angularity should be made by bending thelower rear headers alone, as shown in Fig. 11. While this bending of thelower rear headers will correct the angularity of the tubes 11, it ispreferred to bring the water-wall tubes 36 into proper position bybending the extensions of the diagonally opposite end rear and frontheaders outwardly, as shown in Figs. 1 and 2. 1t will be observed thatthe lower rear header at the left-hand end of this series in Fig. 12 ismade straight, while the corresponding lower front header is curvedoutwardly, so that the tube 11 and some of the tubes 36, connectingthese headers, are angularly arranged. This construction will preventany material reduction in width of the fire-box at either end thereof.

I claim herein as my invention 1. A water-tube boiler having incombination two series of front headers, two connected series of tubesextending in diverging lines from the rear of theboiler to the frontheaders, two series of rear headers, two connected series of tubesextending from the front of the boiler to the rear headers, water-wallsconnecting front and rear lower headers and return connections from theupper to the lower series of headers, substantially as set forth.

2. A water-tube boiler having in combination two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending in diverging lines from thefront of the boiler to the rear headers, two or more of the lower frontand rear headers being extended toward or to the level of the grate ofthe boiler, series of tubes connecting the extensions of the front andrear headers and forming water-walls for the firechamber, and returnconnections from the upper to the lower headers, substantially as setforth.

3. A water-tube boiler-having in combination two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending in diverging lines from thefront of the boiler to the rear headers, the lower front and rearheaders at the sides of the boiler being extended to and toward thegrate-level, series of tubes connecting the extensions of said headers,the extension of one of the front headers and the diagonal opposite rearheader being curved outwardly so as to bring the water-walls at orapproximately at right angles to the front of the boiler, substantiallyas set forth.

4. A water-tube boiler having in combination two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending in diverging lines from the rearof the boiler to the front headers, two series of rear headers, twoconnected series of tubes extending from the front of the boiler to therear headers, a series of tubes connecting the lower front and rearheaders, one of the lower series of headers having their lower endsoffset and made parallel or approximately parallel with thecorresponding headers at the opposite sides of the boiler, substantiallyas set forth.

5. A water-tube boiler having in combination two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending from the front of the boiler tothe rear headers, a series of tubes connecting the lower front and rearheaders, the lower rear headers having their lower ends offset therebybringing the tubes BEST AVAILABLE one 3 connecting the lower headersparallel or approximately parallel with the other crosstubes of theboiler, substantially as set forth.

6. A water-tube boiler having in combination two series of frontheaders. two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending from the front of the boiler tothe rear headers, waterwalls connecting front and rear lower headers, anequalizing-box connected to the lower rear headers and returnconnections from the upper to the lower series of headers, substantiallyas set forth.

7., In awater-tube boiler the combination of two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending in diverging lines from thefront of the boiler to the rear headers, a drum arranged above andconnected to the upper rear headers, tubes connecting the upper frontheaders to said drum, downtakes extending from the drum to the lowerrear headers, and tubes connecting the lower front and rear headers,substantiallyas set forth.

8. A water-tube boiler having in combination two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending in diverging lines from thefront of the boiler to the rear headers, tubes connecting the lowerfront and rear headers, drums arranged above and connected respectivelyto the upper front and rear headers, tubes connecting said drums, andtubes connecting the rear drum to the lower headers, substantially asset forth.

9. A water-tube boiler having in combination two series of frontheaders, two connected series of tubes extending in diverging lines fromthe rear of the boiler to the front headers, two series of rear headers,two connected series of tubes extending in diverging lines from thefront of the boiler to the rear headers, connecting the lower front andrear headers, return connections from the upper to the lower series ofheaders, and an equalizing box connected to the lower rear headersoutside of the circulation of the boiler, substan tially as set forth.

In testimony whereof I have hereunto set my hand.

ARCHIE G. HOHENSTEIN.

Witnesses:

DARWIN S. WoLoo'rr, J. G. DAVIDSON.

